1. Use the built-in function of QQ music client (PC version): open QQ music client. Find the song you want to convert and make sure that you have downloaded it locally. Find the "audio transcoding" function in the upper right corner of the main menu or QQ music (some versions of QQ music may be in the "Settings" or "More" options). Add the local music file whose format you want to convert to the transcoding list. Select MP3 in the output format, and then click Start Conversion.

2. Use third-party tool conversion: software conversion, download and install third-party software supporting audio format conversion, such as format factory and Fengyun audio processing master. Import the song file downloaded by QQ music. Set the output format to MP3 and start the conversion process. Online conversion, visit the online audio conversion website and upload the song files downloaded by QQ music. Select MP3 as the output format in the conversion settings. Submit the conversion request and download the music file in MP3 format after the conversion is completed.